Group 7

Question 1

Give the standard states of the group 7 elements

Answer 1

F / Cl gas
Br liquid
I solid

Question 2

Give the trend in electronegativity moving down group 7

Answer 2

Decreasing

Question 3

Give the trend in boiling point moving down group 7

Answer 3

Increasing

Question 4

State what happens when halide ions react with silver nitrate solution

Answer 4

Precipitate forms
AgCl white, redissolves in dilute ammonia
AgBr cream, redissolves in concentrated ammonia
AgI yellow, does not redissolve

Question 5

Give the trend in oxidising ability down group 7

Answer 5

Decreasing

Question 6

Give the trend in reducing ability moving down group 7

Answer 6

Increasing

Question 7

Give the rule for halide displacement reactions

Answer 7

Halide with lower Mr displaced

Question 8

Give the equation of chlorine reacting with water in sunlight

Answer 8

2Cl₂ (g) + 2H₂O (l) ⇌ 4HCl (aq) + O₂ (g)

Question 9

Give the equation of chlorine reacting with water

Answer 9

Cl₂ (aq) + H₂O (l) ⇌ HCl (aq) + HClO (aq) ⇌ 2H⁺ (aq) + ClO⁻ (aq) + Cl⁻ (aq)